. . . . . . . . display a smooth density estimate.

In dplyr, what function is used to select specific columns from a data frame?

A. select_cols()

B. choose_cols()

C. select()

D. pick()

How do you filter rows in a dplyr data frame based on a specific condition using filter()?

A. filter_rows()

B. row_filter()

C. filter_conditions()

D. filter()

In dplyr, what does the arrange() function do?

A. Sorts the data frame in ascending order

B. Arranges the columns in a specified order

C. Orders the rows based on a specific column

D. Sorts the data frame in descending order

What function is used to create a new variable in a dplyr data frame based on existing variables?

A. create_var()

B. mutate()

C. new_variable()

D. add_column()